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Sirto:I had an unsettling experience on a dive a few months ago, It was a shore dive and everything was ok in the beginning but after a while I noticed a definite resistance when drawing a breath. I checked my gage while inhaling and saw the pressure drop from 2000+ psi to less than 500! I quickly turned to my wife and signalled that I was having a regulator problem and asked her to check that the valve was fully open. She went around behind me but on my next breath I got nothing and the pressure dropped to zero. Assuming that the octopus would not help since the pressure read 0 I gave the out of air signal and started breathing through her octo. We surfaced and started swimming in to shore. I figured that I had a failure of my first stage.
Suddenly a thought occured to me and I asked her to turn the valve the other way. Sure enough the pressure came back.
Lessons learned:
1 - Be careful when openning your valve that you open it fully
2 - Understand that my wife just doesn't get the whole righty tighty thing and
3 - NEVER let her touch my valve while under water
Hope she doesn't read this.